GB1003243A - Improvements in or relating to films - Google Patents

Improvements in or relating to films

Info

Publication number
GB1003243A
GB1003243A GB31974/63A GB3197463A GB1003243A GB 1003243 A GB1003243 A GB 1003243A GB 31974/63 A GB31974/63 A GB 31974/63A GB 3197463 A GB3197463 A GB 3197463A GB 1003243 A GB1003243 A GB 1003243A
Authority
GB
United Kingdom
Prior art keywords
film
polypropylene
mandrel
tubular
expanded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB31974/63A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB1003243A publication Critical patent/GB1003243A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/902—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies internally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0063—Cutting longitudinally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2813—Heat or solvent activated or sealable
    • Y10T428/2817—Heat sealable
    • Y10T428/2826—Synthetic resin or polymer

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

1,003,243. Tubular polypropylene films. E. I. DU PONT DE NEMOURS & CO. Aug. 13, 1963 [Aug. 17, 1962], No. 31974/63. Heading B5B. A biaxially oriented polypropylene film is made by extruding a polypropylene resin in the form of a molten tubular film at 200-275‹ C., advancing the extruded tubular film, at an ultimate rate of at least 10 times the rate of extrusion, over, but out of actual contact with, a cooling surface, the cooling surface consisting of at least two sections, the first being frustoconical with its narrow end facing the point of extrusion, and serving to cool the film to a temperature within its orientation temperature range, and a second section, continuous with the first, and 0À5 to 2 times the length of the first, being cylindrical and serving to cool the film to a setting temperature, the annular surface of the first section making an angle of 22-35 degrees with the annular surface of the second section; and expanding the tubular film to a diameter of at least 1À5 times its diameter as extruded while it is advanced over the cooling surface. The surface roughness of the cooling surface at the juncture between frustoconical and cylindrical sections is preferably 50-500 micro-inches. The ultimate advance rate of the film, and the amount its diameter is increased, are preferably correlated so that the properties of the film are the same in longitudinal and transverse directions. The polypropylene may be a polypropylene homopolymer, a copolymer in which polypropylene is a major component, or a mixture of such a propylene polymer with other polymers, e.g. polyethylene, wherein polypropylene is the major component. The polymer may contain dyes, pigments, fillers, plasticizers or slip agents. In one embodiment (Fig. 1) molten polypropylene is extruded from die 10 as a film 11 and advanced over a cooling mandrel 12 by pull roll set 13. The film is cooled by water circulated in sets of tubes 14A and 14B to 17A and 17B, located in the surface of the mandrel, and expanded by passing a gas via 19A into the mandrel, which is air-permeable, the amount of gas leaving at 19B controlling the inflation of the film. The expanded film is slit by blades 21. In Fig. 2, the tubular film is expanded by air admitted at 20A, forming a bubble between the face of the die and the pull rolls. Excess air is bled off at 20B. Both parts 12A and 12B of the mandrel are cooled by water circulated in pipes 18A and 18B. The film made according to the process is substantially of delta crystalline form, has an orientation ratio greater than 2, an orientation angle of 25-125 degrees and is heatsealable. Specifications 858,616, 882,155 are referred to. Reference has been directed by the Comptroller to Specification 868,388.
GB31974/63A 1962-08-17 1963-08-13 Improvements in or relating to films Expired GB1003243A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US217638A US3246061A (en) 1962-08-17 1962-08-17 Process for preparing biaxially oriented polypropylene film

Publications (1)

Publication Number Publication Date
GB1003243A true GB1003243A (en) 1965-09-02

Family

ID=22811886

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31974/63A Expired GB1003243A (en) 1962-08-17 1963-08-13 Improvements in or relating to films

Country Status (2)

Country Link
US (1) US3246061A (en)
GB (1) GB1003243A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225551A (en) * 1988-11-30 1990-06-06 Nat Res Dev Tubular materials

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3407253A (en) * 1965-05-04 1968-10-22 Toyo Boseki Oriented porous polyolefin-elastomer blend sheets and process of making same
US3343663A (en) * 1965-10-24 1967-09-26 Dow Chemical Co Package and laminate thereof
US3540979A (en) * 1966-07-11 1970-11-17 Phillips Petroleum Co Laminates of similarly constituted films of different crystal structure
DE1660316A1 (en) * 1967-01-03 1971-01-14 Hoechst Ag Method and device for the production of spun-crimped threads from linear high polymers
US3536644A (en) * 1967-06-22 1970-10-27 Nat Distillers Chem Corp Means for providing biaxially oriented polypropylene films with improved physical properties
US3476846A (en) * 1967-07-17 1969-11-04 Du Pont Process and apparatus for extruding polyolefins
US3635633A (en) * 1969-11-26 1972-01-18 Polymer Processing Res Inst Apparatus for biaxially stretching a tubular film
US3666834A (en) * 1970-07-29 1972-05-30 Mobil Oil Corp Oriented thermoplastic films comprising polypropylene and poly(para-tertiary-butyl-styrene)
US3752630A (en) * 1972-01-05 1973-08-14 Takagi H Apparatus for continuous production of thermoplastic synthetic resin tube with heat-shrinking property
GB1452424A (en) * 1974-03-29 1976-10-13 Ici Ltd Composite films
GB1568964A (en) * 1975-11-05 1980-06-11 Nat Res Dev Oriented polymer materials
US4185148A (en) * 1976-05-17 1980-01-22 Mitsubishi Rayon Company Limited Process for producing the polypropylene film for electrical appliances
JPS5727507A (en) * 1980-07-25 1982-02-13 Furukawa Electric Co Ltd Polyolefin film for electric insulation and method of producing same
US4711751A (en) * 1985-01-11 1987-12-08 Thermo Plastic Research Co., Ltd. Process and apparatus for stretching tubular extruded plastic material
JPS63113060A (en) * 1986-06-27 1988-05-18 Shiseido Co Ltd Resin composition with iridescent luster
US6407177B1 (en) * 1995-06-07 2002-06-18 Fina Technology, Inc. Polypropylene blend
JP2001096607A (en) * 1999-09-30 2001-04-10 Suzuki Kanshi Kk Method and apparatus for extrusion molding of thin-wall tube
JP3662912B2 (en) * 2003-01-31 2005-06-22 住友ベークライト株式会社 Tubular resin film manufacturing equipment
JP3710800B2 (en) * 2003-01-31 2005-10-26 住友ベークライト株式会社 Tubular resin film manufacturing apparatus and manufacturing method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3112301A (en) * 1963-11-26 Table
IT557911A (en) * 1954-06-08 1900-01-01
US2852813A (en) * 1956-03-16 1958-09-23 Dow Chemical Co Method for handling and processing tubular film
GB868388A (en) * 1957-06-11 1961-05-17 Du Pont Process for stretching thermoplastic tubing
US3066356A (en) * 1958-04-21 1962-12-04 Allied Chem Extrusion of polyethylene using water as lubricant
US3108851A (en) * 1958-11-10 1963-10-29 Union Carbide Corp Method of biaxially stretching thermoplastic material
US3092874A (en) * 1961-07-17 1963-06-11 Du Pont Production of thermoplastic polymeric film

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225551A (en) * 1988-11-30 1990-06-06 Nat Res Dev Tubular materials
GB2225551B (en) * 1988-11-30 1993-02-03 Nat Res Dev Tubular materials
US5650114A (en) * 1988-11-30 1997-07-22 British Technology Group Limited Tubular materials
US5665297A (en) * 1988-11-30 1997-09-09 British Technolog Group Limited Tubular materials
US5910346A (en) * 1988-11-30 1999-06-08 Btg International Limited Tubular materials

Also Published As

Publication number Publication date
US3246061A (en) 1966-04-12

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